Just what steamship line had yellow funnells

Captain Lord claimed there was a ship with a single "yellow funnell" to the south of the Californian at dawn on April 15th.
In case this isn't what I think it could be (a red herring, somehow mistaking the color of the Carpathia's smokestack, or both), I ask: just what steamship company had yellow-painted funnell's on their ships?

Richard (Love that Californian mystery) K.
 
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